Lean issues
#1
Elite Member
Thread Starter
iTrader: (2)
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,606
Total Cats: 16
Lean issues
Ok im getting REALLy pissed
I started off with the PNP base map which was very very rich... i just am tuning low rpms no load right now (basicly idle) and as soon as i get it to about 14.5 and steady itll slowly just climb to 100% lean and the motor will die. Its like the only way to make the motor run nice is leave it at 12:1
My acceleration wizard is off... AFR target tables are off, and so i sego correction. idk wtf is causing this but its really anoying.
Im using a PLX wideband with all the correct settings
One more thing, with the Ego steps set to 0 it still says 100% ego correction in the VE tuning window...does that mean something?
I started off with the PNP base map which was very very rich... i just am tuning low rpms no load right now (basicly idle) and as soon as i get it to about 14.5 and steady itll slowly just climb to 100% lean and the motor will die. Its like the only way to make the motor run nice is leave it at 12:1
My acceleration wizard is off... AFR target tables are off, and so i sego correction. idk wtf is causing this but its really anoying.
Im using a PLX wideband with all the correct settings
One more thing, with the Ego steps set to 0 it still says 100% ego correction in the VE tuning window...does that mean something?
#5
Elite Member
Thread Starter
iTrader: (2)
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,606
Total Cats: 16
stock mspnp msq for a 94 or 95... only thing changed is overrun is turned off along with acceleration wizard off
http://www.megasquirtpnp.com/models/...Map_101007.msq
The issue is the warmup staying at like 150%...
http://www.megasquirtpnp.com/models/...Map_101007.msq
The issue is the warmup staying at like 150%...
#6
I take it you're tuning at idle and this is occuring. If it's getting leaner at idle I bet your IAT sensor is heat soaking causing it to lean out. You can add fuel by going to advanced-> coolant related air density, then options and changing it to IAT related air density. This will allow you to add fuel as the sensor heat soaks. Then set the RPM values so that it is only active at idle. For example, set it to be disabled after 1600-1800 RPM.
#7
Elite Member
Thread Starter
iTrader: (2)
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,606
Total Cats: 16
how would my IAT sensor be heat soaking... its just in the stock intake tube (im NA btw).
Although it does read too high i think (stock gm sensor and settings)...it read up to like 150* when im NA and its 50* outside
But more importantly, what is wrong with the warmup crap that is making it stay in warmup mode. When i first open up warmup wizard an arrow flashes at -40*F
Although it does read too high i think (stock gm sensor and settings)...it read up to like 150* when im NA and its 50* outside
But more importantly, what is wrong with the warmup crap that is making it stay in warmup mode. When i first open up warmup wizard an arrow flashes at -40*F
#9
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,729
Total Cats: 4,126
what does you CLT and AIT normally read when the thing has been sitting overnight? are they close to ambient? are they close to each other? they are a very important equation in the fuel mix, so if the values arent close neither will your fueling.
#10
Elite Member
Thread Starter
iTrader: (2)
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,606
Total Cats: 16
ill double check, but i believe that the IAT reads high at initial start up... like 50 when its 35 out. the coolant seems very accurate once it gets going but if i remember correctly its a little high at initial start up also
i still really need to know why warmup is staying above 100% tho even when my coolant is 170*F ...this is with the warmup settings given by the stock PNP map
i still really need to know why warmup is staying above 100% tho even when my coolant is 170*F ...this is with the warmup settings given by the stock PNP map
#11
Elite Member
Thread Starter
iTrader: (2)
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,606
Total Cats: 16
yup it said it was 73 degrees when the car has been off for 2 hours and its 40 out.... coolant is very accurate. My warmup seems to be working now?!
so the question now is... why did the GM defults not work for my IAT sensor. do the closed and open sensors have different values because i bought the open element sensor so i can use it once im boosted
so the question now is... why did the GM defults not work for my IAT sensor. do the closed and open sensors have different values because i bought the open element sensor so i can use it once im boosted
#13
Elite Member
Thread Starter
iTrader: (2)
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,606
Total Cats: 16
yes... i tripple checked everything many many times. I guess i can remove the sensor and find my own values?
so my warmup works fine...
But still... every time i pass 14:1 afr it just jumps down to lean and stalls out..or if i m driving and tune up to about 14:1 itll just go lean and not want to drive
WHYYYYYYYYYYYYY
so my warmup works fine...
But still... every time i pass 14:1 afr it just jumps down to lean and stalls out..or if i m driving and tune up to about 14:1 itll just go lean and not want to drive
WHYYYYYYYYYYYYY
#15
Elite Member
Thread Starter
iTrader: (2)
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,606
Total Cats: 16
OK this blows... here is a summary of what is going on:
-IAT sensor seems to be off...reading too hot
-Warmup enrichments work fine...until coolant temp reaches over 160 and/or IAT over 100 (not sure wat is affecting it... and yes ik that IAT is an incorrect reading)... at this point an arrow doesnt show up anymore and it just puts the enrichment strait to 150%
-Engine goes lean and/or stalls as soon as u tune leaner than 14:1
Facts:
-GM IAT sensor with GM defults from easytherm
-stock CLT sensor working perfectly... good values
-Stock PNP 94-95 map with accel turned off and ego+target maps off
-Code set up for PLX wideband and MSnS_extra
-stock engine/injectors
HELP MEEE I WANT TO TUNE!
-IAT sensor seems to be off...reading too hot
-Warmup enrichments work fine...until coolant temp reaches over 160 and/or IAT over 100 (not sure wat is affecting it... and yes ik that IAT is an incorrect reading)... at this point an arrow doesnt show up anymore and it just puts the enrichment strait to 150%
-Engine goes lean and/or stalls as soon as u tune leaner than 14:1
Facts:
-GM IAT sensor with GM defults from easytherm
-stock CLT sensor working perfectly... good values
-Stock PNP 94-95 map with accel turned off and ego+target maps off
-Code set up for PLX wideband and MSnS_extra
-stock engine/injectors
HELP MEEE I WANT TO TUNE!
#16
Your IAT sensor is heatsoaking. It doesn't matter if your're NA or blown with a jet engine. The sensor is heat soaking just sitting there at idle. Go for a drive and see if it cools down with air rushing over it. Saml01 had the same problem in his stock intake tube. The GM defaults work perfect, that's not your problem.
If you think's it's wrong then make up a glass of ice water and take it outside with you. Pull the sensor and put it in the water. Should be close to around 34* F.
If you think's it's wrong then make up a glass of ice water and take it outside with you. Pull the sensor and put it in the water. Should be close to around 34* F.
#17
mkturbo.com
iTrader: (24)
Join Date: May 2006
Location: Charleston SC
Posts: 15,193
Total Cats: 1,685
It is your IAT sensor heat soaking as people have said. I had the same problem with mine when I was running around na during the summer. The stock intake tubing does not do a good job of getting cool air. With your car just sitting there you quickly start to pick up warmer and warmer air that is in your engine bay. I will try to post up my settings for IAT correction that I was using during the summer later tonight.
#19
Elite Member
Thread Starter
iTrader: (2)
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,606
Total Cats: 16
thanks a lot guys, merry xmas!!!! ill put in the new values 2morro
As for my other 2 problems... why do u think the warmup enrichments go nuts after the car is at full temp?? and why cant i tune to stoch without it just climbing to lean and stalling?
As for my other 2 problems... why do u think the warmup enrichments go nuts after the car is at full temp?? and why cant i tune to stoch without it just climbing to lean and stalling?
#20
ill double check, but i believe that the IAT reads high at initial start up... like 50 when its 35 out. the coolant seems very accurate once it gets going but if i remember correctly its a little high at initial start up also
...
yup it said it was 73 degrees when the car has been off for 2 hours and its 40 out.... coolant is very accurate. My warmup seems to be working now?!
so the question now is... why did the GM defults not work for my IAT sensor.
...
yup it said it was 73 degrees when the car has been off for 2 hours and its 40 out.... coolant is very accurate. My warmup seems to be working now?!
so the question now is... why did the GM defults not work for my IAT sensor.
Strangely, I can't get my car not to idle. I can get it to idle uneven, but even when my wideband reads 16.0:1 it'll sit there and happily idle along at like 550 rpm with the IAC closed and the throttle against the stop. I was trying to pick a good amount of fuel for idle, but it just kinda doesn't seem to matter. Richer than maybe 13.0:1 and it doesn't idle as well.